Abstract
The purpose of this investigation is to visualize the unsteady flow induced by variable inlet guide vane (VIGV) of a small turbine for automobiles. Instantaneous flow fields of the VIGV are visualized with PIV and phase averaging method. Experimental conditions of the flow around the VIGV depend on the existence of air bubbles. In order to remove these air bubbles, stabilizing core is installed at the center of the VIGV. Rotating cells of high velocity are moving from the pressure side to the suction side, which is synchronized with pressure fluctuation. A region with strong vorticity is also moving. When the leading and trailing vorticity is increasing, throat velocity of VIGV is increasing.
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